Muffler cut-out



Aug. 2, 1927. 1,637,761

; H. R. BUTLER MUFFLER CUT- OUT Filed June 25. 1923- t Elk INVENTOR HENRY R. BUTLER A 7' TORNE' Y6.

Patented Aug. 2, 1927.

UNITED STATES" "PATENT OFFICE.

HENRY :a. BUTLER, or OAKLAND, CALIFORNIA, ASSIGNOR on ONE-HALF TO 'rnno- DORE H. coon, or OAKLAND, CALIFORNIA.

MUFFLER CUT-OUT.

Application filed June 25, 1923. Serial No. 647,562.

This invention relates to muffler cut-outs, and has for its object to provide an attachment for ready connection with mufflers of automobile engines which are not originally equipped with cut-outs. i

This object I accomplish by the provision of a tubular sect-ion which can be substituted for a section of regular exhaust pipe in front of the muffler and containing spring actuated valve mechanism controllable fromthe drivers seat for yieldingly maintaining the valve in either open or closed position. 1

One form which my invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which- Fig. 1 shows a plan view of a' muffler cutout embodying my invention.

F ig. 2 shows a side elevation of Fig. 8 shows a cross section.

The device comprises a tubular section 10 designed to be inserted in front of a muffler 11. This is done by cutting away a section of the regular exhaust pipe 12. The tubular section 10 has a rectangular portion extending downwardly therefrom, the bottom of said rectangular portion being formed with an opening 18 in one side controlled by a pivoted flap valve 14:. A pivot shaft 15 of the valve extends at right angles to the axis of the exhaust pipe and one of its ends is bent to form a crank portion 16. This crank portion 16 is located exterior of the rectangular portion and is connected to a rod 17 exthe same.

tending forwardly to the drivers seat. Con- I nected to this crank portion is a coiled spring 18 anchored at one end to a lug 19 projecting from the side of the tubular section. vThis spring is disposed at such an angle that the valve is yieldingly held in either open or closed position. When the valve is raised it will be in such a position that it will obstruct the passageway to the mufller and direct the gases out through the bypass. When closed, it covers the by-pass and allows the gases to pass unimpeded to the muffler.

I It will be noted from the drawings that the crank'portion of the pivot shaft 15 and the cOil spring 18 he alongside of the rectangular portion vof the tubular section. This is particularly desirable as it forms a very compact device and insures that the operation of the crank and spring will not be interfer d with by other elements of the automobile and will not be exposed to disarrangement or injury by other operating parts of the car.

Various changes inthe construction and arrangement of the several parts herein shown and described may be employed without departing from the spirit of my invention as disclosed in the appended claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: I

A cut-out for mufflers comprising a tubular section for insertion in the exhaust pipe in front of a muffler, said tubular section having a rectangular portion extending downwardlytherefrom, the bottom of said extension being formed with an opening,

a flap valve mounted in said rectangular ating the valve, a lug projecting from the side of the tubular section, and a tension spring connected to said lug and to said crank portion of'the pivot shaft, said lug being disposed at such an angle with relation to the pivot shaft that the spring will yieldingly retain the valve in either open or closed position, said spring and crank portion of the pivot shaft lying alongside of said rectangular portion of the tubular section.

HENRY R, BUTLER. 

